/in/foo.cc: In function 'int prim(int)':
/in/foo.cc:178:23: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if (edge_ind&1==1)
                      ~^~~
/in/foo.cc:195:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^